Promise vs Observable

ts

Single value (Promise) vs multiple values (observable)
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const numberPromise = new Promise((resolve) => {
    resolve(5);
    resolve(10);
});

numberPromise.then(value => console.log(value));
// still prints only 5


const numberObservable = new Observable((observer) => {
    observer.next(5);
    observer.next(10);
});

numberObservable.subscribe(value => console.log(value));
// prints 5 and 10

/**
    let i = 0;
    setInterval(() => {
        observer.next(i++);
    }, 1000);
*/

+ similar syntax
 Single response is good for Simple HTTP request, but multiple responses/subscriptions are good for: 
 
+ setInterval calls,
+ webSockets,
+ DOM events (mouse clicks etc.),


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http://rxmarbles.com/